'Every minute they are being held is a minute too long,' White House says of Brittney Griner and Paul Whelan as US works for their release

Senior administration official assesses that the amount, spent since 2014, is just 'the tip of the iceberg,' more went undetected

Embassy urges US citizens to leave Ukraine if possible ahead of six-month anniversary of the invasion of Ukraine on Wednesday

Moscow says facilities temporarily unavailable for New START treaty inspections, since Russian officials cannot get to US due to sanctions, COVID

In response, Putin says nukes should 'never be unleashed' since there would be 'no winners' in such war

Pressure has mounted in recent weeks, after Senate passed bill to designate Moscow as sponsor of terrorism over invasion of Ukraine

Top US diplomat doesn't reveal how Lavrov responded to talks, says he also pressed him on prisoner swaps, grain shipments through Black Sea

State Department says Moscow's announced departure after 2024 an 'unfortunate development'; space exploration one of few areas where cooperation remained unaffected by tensions

Russia and the US have worked side by side on the ISS, which has been in orbit since 1998, but tensions have risen since the invasion of Ukraine

Israeli-American backpacker eventually pardoned by Putin gives interview as US basketball player Brittney Griner suffers similar ordeal: 'I know what she’s going through'